Electromagnet.



E. BACHELET.

BLEGTROMAGNET.

APPLICATION FILED IEILIB, 1907.

946, 1 93 Patented Jan. 11,1910.

cul'on. adzelei EMILE'BACHELET, OF NEW YORK, N. Y.

ELECTROMAGNET.

Specification of Letters Patent.

Patented Jan. 11, 1910.

Application filed February 18, 1907. Serial No. 357,989.

lb all whom it may concern:

Be it known that I, EMILE BAoHnLn'r, of Sew York, in the county of New York and State of New York, have invented certain new and useful Improvements in Electromagnets; and I hereby .declare that the following is a full, clear, and exact description thereof, reference being had to the. acconr panying drawings, which form part of this specification.

This invention is an improvement in electro-magnetic-therapeutic devices such as are disclosed in my Patents No. 743,372 and No. 743,373 dated November 3, 1903; and the principal object of the present invention is to improve the construction of the electromagnets of such magnetic field generating devices whereby the lines of force generated by the magnet can be concentrated principally at one side thereof so that the magnetic field will be greatly intensified at one side of the magnet and corres ondingly reduced at the other side thereo This eifect is particularly noticeable when the magnet is energized by an interrupted current, the potential force of the ma net being in such case increased nearly oneourth.

The invention will be fully understood from the following description of the magnet illustrated in the drawings, in which Figure 1 is a perspective View of the magnet with the face fully opened. Fig. 2 is a similar View with the parts detached. Fig. 3 is a vertical section through the magnet showing one of the magnetic field regulating shields in place. Fig. 4 is a rear view. Figs. 5 and 6 are detail views illustrating some forms of the interchangeable magnetic field regulating shields.

The magnet is provided with a large fiat coil 1 of insulated wire, and preferably has a core 2 of soft steel or iron; this coil is inclosed by a casing of suitable material. As shown thecasing has an annular portion 3 surrounding the circumference of the coil,

and a circular portion 3 covering-the rear end of the coil. A

The coil may be confined in such casing by means of a circular plate 3" of mica, compressed fiber, or other suitable non-magnetic material, which will not interfere with the lines of force, and the front edge of the portion 3 of the casing may be threaded and a flanged ring 3 be screwed thereon, the flange of the ring extending over the edge of the plate 3 as shown.

' The core 2 can be secured to the casing by means of screw 2 if desired, and the terminals of the coil may be' respectively con nected to binding posts l and P secured to the casing but insulated therefrom by plugs 4, 4 of fiber or other suitable non-conducting material.

The casing may be made of any suitable material. At the back or rear end of the magnet, or the side next the disk 3 of the casing, Iplace a metallic plate 5 which may be said to short-circuit the magnetic lines at that side of the magnet, that is when such [a plate is used, as indicated in Fig. 3, the

magnetic lines of force will be much greater at the right-hand or open side of the magnet than at the left-hand or closed side thereof. This augmentation of the lines of force at one side of the magnet and lessening of the lines of force at the other side of the magnet, is due to the presence of the metallic plate, or deflector, and I have demonstrated by actual tests that the strength of the magnetic field at the right-hand side of such a magnet, when using a direct interrupted current to energize the magnet, will be enhanced one-fourth in power over what it would be if the deflector is not employed.

The disk 5 might form the rear wall of the casing,or in other words the rear wall of thecasing might be used as an equivalent of the disk 5 if the casing be made entirely of metal; or the. disk 5 may be used whether the casing be made of metal or not.

In order to vary or distribute the field of force without changing the intensity of the current transmitted through the coil,.I can employ removable shields or screens 6, which may be in the form of disks adapted to cover the open end of the magnet and may be removably secured thereto in any desired manner. These screens may be of any suitable material but I prefer to make them of magnetic material such as iron or steel. As shown the screens are held between clips 3 attached to the casing. These screens are adapted to more or less screen the open end of the magnet and for this purpose they may be provided with openings of different sizes, as indicated in Figs. 5 and t) of the drawings. -The number of lines of force transmitted through the magnet and the intensity of the magnetic field developed thereby depends upon the size and number of the openings in the screen. When the full power of the magnet is desired the screen can be entirel removed.

Having described my invention What I desire to secure by Letters Patent is 1. In an electro-magnet, the combination of a coil. a metallic deflecting plate at one end of the coil, and a removable screen of magnetic material at the other end of the coil.

2. In an electro-magnet, the combination of a coil, a casing therefor, a magnetic metallic deflecting plate in the casing at one end of the coil. and a removable screen of magnetic material at the other end of the coil.

3. In an electro-magnet, the combination of a coil, a core, a casing inclosing the coil, a non-magnetic plate closing one end of the casing. a metallic deflecting plate at the other end of the coil within the casing,'and a removable screen plate of magnetic material at the end of the coil opposite the de fleeting plate.

4. In an electromagnet, the combination of a coil, a casing 01" non-magnetic material surrounding the coil, 21 non-magnetic plate at one end of the coil, and a deflector of magnetic material secured Within the casing at the other end of the coil.

In an electro-magnet, the combination! scenes of a flat broad coil, its core, a cylindrical casing of non-magnetic material surrounding the coil, a non-magnetic plate at one end of the coil, and a plate of magnetic material in the casing at the other end of the coil.

6. An electro-magnet comprising a coil, a core, and a casing of n0n-magnetic material inclosing the coil; a non-magnetic retaining plate at one end of the coil confining it in the casing, and a deflecting plate of magnetic material in the casing at the opposite end of the coil.

7. An electro-niagnet comprising a coil, a casing of non-magnetic material inclosing the coil, a non-magnetic plate at one end of the coil and closing one end of the casing. and a deflecting plate of magnetic material at the other end of the coil Within the casing.

8. An electro-magnet comprising a coil, a

i core therein, a casing of non-magnetic mate rial inclosing the coil, and a deflecting plate of magnetic material at; one end of the said coil.

In testimony that I claim the foregoing as my own, I afiix my signature in presence of two witnesses.

EMELE Witnesses Jenn L. FL -"rotten, ARTHUR E. Downnn. 

